XPATH - Select all child nodes with a specific attribute

Question

What would be the xpath query to find all child nodes with a specific attribute value, but starting from a node with a specific attribute value?

This is kind of rela

Answer 1

$xpath->query("//*[@rdf:about='http://rdfs.org/sioc/ns#']/following-sibling::*/@rdf:about");

With your sample script, outputs URLs starting/ending with:

http://rdfs.org/sioc/ns#Community
http://rdfs.org/sioc/ns#Container
...
http://rdfs.org/sioc/ns#reference
http://rdfs.org/sioc/ns#subject